Two synchronous generators supply a load of 5 MVA with a power factor of 0.8. No-load frequency of the first generator is fni,1=52 Hz. Spi is 2 MW/Hz and Sp2 is 1 MW/Hz. The system is operating at 50.5 Hz frequency. a. Find the no-load frequency of 2nd generator. Find the power sharing between 2 generators. Sketch the (P-f) graph. b. When loading level increases %10 Find the new system frequency and power sharing Sketch the (P-f) graph. c. To restore the frequency value of the first condition (a), the governor changes the no-load frequency of 1st generator. Find the new fnl,1 and the new power sharing between 2 generators. Sketch the (P-f) graph.

Two synchronous generators supply a load of 5 MVA with a power factor of 0.8. No-load frequency of the first generator is fni,1=52 Hz. Spi is 2 MW/Hz and Sp2 is 1 MW/Hz. The system is operating at 50.5 Hz frequency. a. Find the no-load frequency of 2nd generator. Find the power sharing between 2 generators. Sketch the (P-f) graph. b. When loading level increases %10 Find the new system frequency and power sharing Sketch the (P-f) graph. c. To restore the frequency value of the first condition (a), the governor changes the no-load frequency of 1st generator. Find the new fnl,1 and the new power sharing between 2 generators. Sketch the (P-f) graph.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.6P

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Concept explainers

Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.

Question

I need to answer of this quesiton also there is writing %10 in red text on b part. Thank you for support

Two synchronous generators supply a load of 5 MVA with a power factor of 0.8. No-load frequency of the first
generator is fni,1=52 Hz. Spi is 2 MW/Hz and Sp2 is 1 MW/Hz. The system is operating at 50.5 Hz frequency.
a. Find the no-load frequency of 2nd generator. Find the power sharing between 2 generators. Sketch the (P-f) graph.
b. When loading level increases
%10
Find the new system frequency and power sharing Sketch the (P-f) graph.
c. To restore the frequency value of the first condition (a), the governor changes the no-load frequency of 1st generator.
Find the new fnl,1 and the new power sharing between 2 generators. Sketch the (P-f) graph.

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